# Dark Energy and extended Standard Model with Mirror Matter (SM$$^3$$)

The newly proposed phenomenological mirror-matter model (M3) has just been developed into a full-fledged theory – extended Standard Model with Mirror Matter (SM3). Dark energy is simply understood as the leftover vacuum energy due to the spontaneous mirror symmetry breaking.

Here is the link: https://arxiv.org/abs/1908.11838

Many new insights: why neutrinos are Dirac particles not of Majorana type? Why neutrinos have so tiny masses? Why the lightest neutrino is not massless? Why charged leptons (electrons, muons, and tauons) have similar masses like the down-type quarks? Why vacuum expectation value, top quark mass, and Higgs mass have such a simple relation of v2=2m2t=4m2h ?

Underlying principles of SM3 : We live in a maximally interacting, supersymmetric, and mirrored world.

A perfectly imperfect mirror symmetry is indeed the key to unlock the beauty and elegance of our universe.

## Author: Wanpeng Tan

As a research professor at Notre Dame, I share my ideas and thoughts mainly about mirror matter theory and open science on this blog. Under the new theory, we live in the universe with a mirror (hidden) sector of particles. A perfectly imperfect (minimally broken) mirror symmetry is the key to unlock the beauty and elegance of our universe. Click on the menu links for a popular introduction, a technical summary, and list of my papers on the new mirror matter theory.